DIY Hot Tub Solar Heating Answered
Hi. I have a solar tub heating system 3/4s complete. It's based on a 100W PV panel to drive a pump, charge the battery and supply the electronics. A 16.5 sq ft solar water collector to heat the water. The heart of the system is a (made in China) DST1020 water temperature controller. My first thoughts are to open the flow of hot water to the tub at around 25degC, and cut it of at around 34degC. Problem - this controller has a reputation as a great little device, but it's a b**ch to program, the various instructions online just don't work. All I want it to do is close the heating dry relay contact at 25C and open at 34C. Easy? No. Has anyone got experience of this controller?